David Letterman ended his 33-year reign over latenight with an emotional final episode last night (May 20), and as we mourn his departure, Hollywood mourns with us.

While some celebs joined Dave onstage for a final, farewell Top 10 countdown, many, many others were saying their own goodbyes, onscreen and on the internet. Below, we round up the best ways that our favorite stars said #ThanksDave.

Dave's fellow latenight hosts were the first to wish him a warm farewell, starting with Jimmy Kimmel.

And Conan O'Brien was joined by Patton Oswalt in begging "Conan" viewers to change the channel and watch Dave's last "Late Show" instead.

Meanwhile, Elizabeth Banks got emotional, fast.

Jessica Alba got nostalgic for the time she made a "Late Show" appearance for two.